Shuttle-driving mechanism for sewing-machines



H. COHRALL ANDB. A. STEVENS.

SHUTTLE DRIVING MECHANISM FOR SEWING MACHINES.

APPLICATIQN FILED wIY 14. 192|.

v 1,385,363. y Pnwdmyzs, 1921.

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HERBERT CORRALLQOF HELENSBURG, .AND BERTRAM AMBROSE STEVENS, OF CLYDE- BANK, SCOTLAND, ASSIGNORS TO -TI-IE SINGER MANUFACTURING ELIZABETH, NEW JERSEY, A CORPORATION 0F NEW JERSEY.

COMPANY, or

Specification of Letters Patent.

Patented July 26, 1921.

Application led May 14, 1921. Serial No. 469,680.

To all whom t may concern:

Be it known that we Hnnnn'r ConRALL and BERTRAM AMBnosE TEVENS, subjects of the King of the United Kingdom of Great Britain and Ireland, residing, res ectively, at Helensburg, Dunbartonshire, `cotland, and (llydebank, Dumbartonshire, Scotland, have inventedcertain new and useful Imrovements in Shuttle-Drivin Mechanisms ihr Sewing-Machines (for wiich we have iiled a` lication in England, May 7, 1920, Serial o. 12,690,) of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to sewing machines used in the manufacture and repair of boots and shoes and other articles made of leather or cloth and provided with a cylindrical bed of small cross-section adapted for stitching tubular articles.

`Owing' to the nature of the Work, foreign matter not infrequently passes into the lower thread handling mechanism and the mechanism for actuating the same, in consequence of which it `is subject to rapid wear and thus requires frequent renewal. i

An object of the present invention is to provide means whereby the replacement of the worn underthread handling mechanism may be readily eilected with ease and certainty by any unskilled operator and without requiring the attention of a skilled mechanic to obtain satisfactory results and at the same time maintainingthe timed relation between the needle and Aunder-thread handling mechanism.

In its preferred form, the improvement comprises an interchangeable self-contained filling or removable housing containing the under thread handling and actuating mechanism in properly timed relation, which housing can be readily removed from-or attached to the work-support. AIn one form of the improvement the housing is seated within a recess or channel formed upon the under side ofthe Work-support to insure the maintenance of its proper alinement with the needle and prevent its displacement due to vibration of the machine `or other causes during its operation.

The housin may be secured to the worksupport by astening screwswhose heads are recessed in the housing and "which are prevented from falling out from the housing by a cover-plate secured to the housing and provided with orifices in alinement with the fastening screws whose heads are accessible through the orifices.

The invention is illustrated in the accomp anying drawings in which Figure l is a s1de elevation of the sewing machine embodylng the present improvement, part of the work-support being shown in section to better illustrate the mounting of the removable housing. F ig. 2 is an end sectional elevation of the work-support upon the line azz-wr, Fig. 1. Fig. 3 is a bottom view upon an enlarged scale of the removable housing with a portion of the cover broken away `to expose the rack-and-pinion driving mechanism; and Fig. 4 is a longitudinal sectional elevation of the removable housing upon the line -an Fig. 3.

Referring to the drawings, the present improvement is shown as embodied in a sewing machine provided with the base 1 from which rises the standard 2 having the usual bracket-arm 3 terminating in the head 4. J ournaled in suitable bearings in the bracketarm 3 is the main shaft 5 provided with the belt-wheel 6 having a cam-groove entered by a pin 7 formed upon the end `of the needle-lever 8 fulcrumed at 9 upon the bracket-arm 3. The other end of the needlelever has a sliding connection 10 with the needle-bar 11 mounted in the head 4 and provided with the needle 12. Also mounted in the head 4 is a universal feeding mechanism comprising the feeding foot 13 suitably actuated by mechanism (not shown from the main-shaft 5 of the machine. 14 denotes the usual presser-bar spring and 15 the needle-thread take-up common in machines of this type.

Extending longitudinally from the base 1 is the cylindrical work-support or arm 16 upon whose free end is suitabl supported the under-thread handling mec lanism. In the preferred form of the improvement that portion of the work-support which sustains the under thread handling mechanism is of inverted U-shaped cross-section, as clearly shown in Fig. 2, the depending sides 17 of the Work-support forming a channel to receive the removable housing 18 containing the under thread handling mechanism `comprising the shuttle driver or carrier 19 actu- 1 ating the shuttle 20 containing a mass of applied to` or remove lower thread wound upon the bobbin 21. The shuttle driver or carrier -19 is formed with a depending bearing stud 22 suitably journaled near the free end of the removable housing 18 and has secured thereto the pinion 23 actuated from the rack 24 by the intermediate pinions 25 journaled upon the housing 18. It will be observed that the pinions 23 and 25 are mounted in recesses 26 formed in the housing which is also provided with a slideway 27 to receive the v rack 24.

containing the shuttle-driver or carrier 19 and certain of its actuating mechanism such as the pinions 23 and 25 and rack 24 may be assembled when disassociated from the sewing machine in properly timed relation and from the machine without disturbing this relation, permitting these parts when worn to be Vreadily replaced by an unskilled operator.

The mechanism for actuating the under thread handling mechanism comprises the cam 32 secured to the main-shaft 5 and provided with a cam-track 33 entered b a roller-stud 34: secured to the upper end7 of the lever 35 pivoted at 36 to the standard 2,

,the lower end of the lever 35 having a link connection 35 with the, rack 24 as is well known in the art. Y

The machine is provided with the usual needle-plate 37 pivotally secured to the "work-support by the screw 38 and is retained in operative position by the spring pressed pin 39 mounted in the work-support. When access to the shuttle 2O is desired, the stud 40 is depressed'until the pin 39 is disengaged Jfrom its aperture in the .needle-plate when the latter may be swung upon its pivot 38 to expose the shuttle 20.

Having thus set forth the nature of the invention, what we claim herein isr 1. In a sewing machine, in combination,

i a frame including a work-support, stitchforming mechanism incorporated in said frame -including a reciprocating v needle, a loop-taker, a main-shaft and connections for operating the needle and loop-taker in timed relationto one another, a removable housingv secured to saidwork-support and carrying the loop-taker and certain of said connections whereby the loop-taker and its operating connections may be removed from and replaced as a unit in the machine while preserving the timed relation of said parts.

2. In a sewing machine, in combination, upper thread handling mechanism and means for actuating the same, a work-support, a housing removably secured to said work-support, under thread handling mechanism adapted to coperate with said upperthread handling mechanism in the production of stitches and mounted upon said housing, and means for actuating said under thread handling mechanism.

3. In a sewing machine, in combination, upper thread handling mechanism, means for actuating the same, a work-support provided with a recess, a housing removably secured in said recess in said work-support, under thread handling mechanism adapted to coperate with said upper thread-handling mechanism in the production of stitches and mounted upon said housing, said housing being removably secured in said recess in said work-support, and means for actuating said under-thread handling mechanism.

4. In a sewing machine, in combination, upper thread-handling mechanism, means for actuating the same, a Work-support, a housing removably secured to said worksupport, and under thread-handling mechanism comprising a shuttle, a shuttle-driver,

and rack-and-pinion actuating means forsaid shuttle mounted upon said housing.

.5. In a sewing machine, in combination, upper thread-handling mechanism, means for actuating the same, a work-support, a housing removably secured to said worksupport provided with recesses, under threadhandling mechanism comprising a shuttle, and rack-and-pinion actuating means for said shuttle disposed within the recesses.

6. In a sewing machine, in combination, upper thread-handling mechanism, means for actuating the same, a work-support, a removable housing provided with recesses, under thread-handling mechanism mounted upon said housing and comprising a shuttle, rack-and-pinion actuating means for said shuttle disposed within said recesses, a cover for said housing provided with orifices, and screws for securing said housing to said work-supportthe heads of the screws being accessible through the orifices in the cover.

In testimony whereof, we have signed our names to this specification, in the presence of two subscribing witnesses.

HERBERT CORRALL. BERTRAM AMBROSE STEVENS.

Witnesses:

KATE FOTHERINGHAM, ISABEL ROLLO. 

